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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c596bea4889829e491f8d02eaa1bed1e06ffb76fad1c704894eaf5add771dd8' 
  AND token = '4Dbgi0zsTAOqdFayMT06WgL+8Dc7xsrR+vF1Pze0cSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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