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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2a0de95c0ac1c3b2e1ab0f0cf87c502d0cc2b3de9f22abae9b427edef4963cf' 
  AND token = '8OJ2nVzLTCdjxLhBcxttT80RS7ik/rj3ESeC/ebX7GI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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