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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c84098422ddc2c7b4f7cad2371108d3eeddf55de0e0cd13f37cc8c1de054375' 
  AND token = 'q/tcmsl4cJGWPICz+1A/2hS66SRd3MU06jY9Xe2HEDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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