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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e06c4f5b68a318f2c355b93840d1d8a17997a63a8a5d8c1706a53f722bd76451' 
  AND token = 'KUOQsd8Mqs3YdX810oCMlm1B2So+DRk9UQvzOAiF/Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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