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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b0567c4e05831171a005176ababedaa1836ab25ba80c961cba3368f39695a9c' 
  AND token = 'hL3D/6zJ9g5TX5Ww3gdYozezSknAR2F8bQKz2S2efE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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