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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8f45f6617a9ac3d140848e86a9656f392f61c49ff3f8d3d241d46c7a1f261c9' 
  AND token = 'mghv3DqXd22tm3wd0b1safq9t5epjVva5c5ja2XKiIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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