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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8743bd27945b66f0a3b70c6c7962f77cd103f00a663124f2bbf9e050f104fd9' 
  AND token = '0uTuUFraGF2R/REdSBeVUJngWBsD8B77Nw2jATSp6B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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