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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e5b7617cb2d393f1cf4409c5de50f2a7d6d49204c2e1dd6e245d6e9518ace6c' 
  AND token = '7yKhOfiDfdy/qd9nNSz8lGIAGlokHKMgyZSPjgOsrrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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