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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75d37048ef50a0d87310909e3c1723875b020c9c70cf10381e72a22f288e92d4' 
  AND token = '/iTUtGreyVOFNOTAJvOReYXPxrMKxPma6WzcFKzPe/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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