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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89a4748d7d28133b6769b7a4fabed6edce4fe4529a13136cf1d3adb75e08bffb' 
  AND token = 'soPVN2FIMsi6+p/bmPf2lw44D1COAp7hdqb0McMpit0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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