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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19a968a90d2eb0fc3edcecd6e54e93281ab69e73d342f0243f3d551adfb5e23c' 
  AND token = 'nksCb5sJDqd2Xki9w4dwP02PitoOpnqEi1MUHAvEDCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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