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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '680fe4a03c4c812c5e86d6b183a4f1c94079078504c258cac87628fd5340d18e' 
  AND token = '1nGci6NGSxntBPaqWw2OItijlETO8V/5iXmOtdP6fkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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