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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fba045f9ea3ed0bd15220a95edf978d3d863ba49534a960b1952b00e54fc9d21' 
  AND token = '3HY7yfTnubcES65lS6huo7q8oSSPbf1c1xB9zIVcJxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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