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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cae22f05c10af5fa41e53fb4d40803fafb7894645046309f9969c520c0de6ee3' 
  AND token = 'N5rTU+VYIWZQlV2nRTJB1Nn+Shr08x6+rnoKb0S8Sk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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