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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '658d1d191bf114cf424c963cc61fbfc8b2f1c120c40810c64df768b22df8bed7' 
  AND token = 'DZAGi6spn9q23f51QNqdSfOTMat42v7v/CVUKGIxKnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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