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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24d06dfb2f05956d1278a1aa4b29733aff82a9d8600bf676055898c44959fd1c' 
  AND token = 'Cblm3Xkb+Ey1iSh8McHjw+a8RsUh7vj8mIlxRaEBs3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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