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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa970b4110fed6a1898d0365da985519ae17155cc4d47932633d0a4f4270b12e' 
  AND token = 'y1RUWQ7qzng0YfrF5VaZWMTesNcklB7l/lXQLYG1auA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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