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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eaeea4391d2959d586ba673194742c5673444b081c05ea7c6cb4a8a41b57e442' 
  AND token = '5vk6Xcnx0Ni7VXMKcuiFCGBmPvnXVXB38Ic0Kb3CjZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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