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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc819e88ed6b83cc9ad390c1cd0d64c213984645e7fac398712951835e6b8a40' 
  AND token = 'p6KunvL2L3LLQ2MDNYWMrxevL75Oy0cj56hctH1lLn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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