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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a3665e0b177991bfa6a9c3c9a7345b4d45539b045b193bdf64a4b700f670775' 
  AND token = 'c+Ju6HyIBZRueIwWrQOz+Ss7nR1y7XSlmnoXAdrKuQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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