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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75b80955fe05e2fac765fea2a1edcf3e031862e99390a3eb324b2029dd891b46' 
  AND token = '7svM/JsBbxdIfDgXpykO4ISlKIYl9aMIcdlmmdwarm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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