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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae5ef4adb3fa2ec45e88d08dcff1509e10deb8e804c8b4cc50deba77eb9b0e70' 
  AND token = 'uv28cWNASSADiq617cw5r0VBO5Rte+JhtDM1GYaW5BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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