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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1529c7c4b8e8cee4cf11d7fd6b73db73e3f41ae16579ae65601b9ca9e3aef7a0' 
  AND token = 'TV6Ngkd1KxVLs3OgyWizrr1wE+TF92bvhJ7ptFlTWN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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