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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f011a06a2d5b03df753d3f3cfa643d82953e2275b17ffb811a3d8a6aae278ac' 
  AND token = 'c/FptZSRTxaMibet89a00GDnCvUT+faP2R5MRSbxg1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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