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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33032ba3d61cb8f09a0267f69144913fe5456b6efdd3a3aac849c573ef27e013' 
  AND token = 'qEJ4Oe5G6AAKLQk2mZ5V/j/NKiER5LGlKQPVf5rtLmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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