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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da5c5b2fd1d8a1953ae9097382ae000dbcadb01aa8c751ea2b6a79af2ac22894' 
  AND token = 'pj/qIhmx5C+HpIhQWMYiTFra6sFXrSw85p4v/Axa08A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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