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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b6aa13ad91901d25afc5d3a9e22688fc0608319fb611c2e040c037f13f649c1' 
  AND token = '0eZXRpv6DPIBvtx6G06M00GJoFjCysoxuPv+Lj+zUWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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