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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0db6295b0209bdae08e1e39f081f4ca7631da5bd11ab33cdc2f124cb6a74aacb' 
  AND token = '/foFG1j8zAcZsXA8l5IbtmSRW2ACVqm/KnpP56clAHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}