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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a08b079c0b3edb326dfdd5e9ac949e2bb993f8d1c150aab7ac4077a2162778b2' 
  AND token = '/Wn4TxkPuRID2V5FAQB+1ke7cQARaPV0R24Q7KMWcHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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