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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd525e7fc2837905dfed12fd464d0488824d2ddee82e9d36b5b55eb4332f38bbb' 
  AND token = 'AC3G1ub1ll1E5RpQVDWCGmwcldCo7ys+u2MDdVkYrgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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