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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26186a2a0ee7c869fc2331b2e5bc53c329bb3e98fd664f118ce396a33c36bf10' 
  AND token = 'sopjmNs2U5VCwpFq/bjTNDP4s8Izym4tyYNah/wB21I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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