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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eebc2e859e60aa6e9cab4f7fbd2fadd5bc5cd176786c74ed9d4aca81e3dd6bb0' 
  AND token = '6sqhVi2BuVi2YUoyHxMNW4+wk/TN/hdfCkhyHPBxXko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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