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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f2609ea3f61b30e31e4a3d6ff1cf93dfa1cb0b13eda66685e4d9388c8bd7f99' 
  AND token = 'z8xXuRJAPbD2Jmmo3VDTM8RBToU10FCDy3Ii6giNpkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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