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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76ef54fbff0c96d8ec8f84bd3f4d038d4eeb978f19c17707c6def0fa8cb943c6' 
  AND token = 'B4r0EB27m7bHPepm6S78ho9Ldc+UXe6591KsfhOk5yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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