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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6816bf37da36122a2297e7851ffe9ee0a4e77d1f01027d45cd51f4f673525847' 
  AND token = 'uU99Q9zY2bEI5mRoPyTs/W5tEnLuu2pypAHxjQv2DPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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