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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a689a3a596787e4d838e249cc374e963da4f43cace9f684f921a3855af49093' 
  AND token = 'BEy9lNcVCTyFNGV+KXI/EeACBm9CAyOdnBn2s9icUJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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