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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a5d8eceec4ada2e18c32d55f8115283d4ab7b357e4c0a54774faf04c22baa311' 
  AND token = 'mpbZvfO5ZGhgZlC4Nd1h9lnl/n6ChKjLacX66b2N084=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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