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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10a78889cedaa1b6d675268bf38109cc579b67aa41aa8552bf0743b1836ad6c6' 
  AND token = 'gfrWu2ljr4v19++LSuWQG4bLjrvPeXELgA6TMvkfoIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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