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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17e499f3290aed295a681c84ff7c168e324c3d2204824faf0bb532ecf745b02b' 
  AND token = 'bXs39Y5UZv7mOgkwSyqDSGP9tsEEd16k73jnd1DDMx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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