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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b59d803d89c62b0813cf47a723bbd4f26de8ac2ba669d0d391c3cb93b1c673f' 
  AND token = 'z1dLdgi4qLB6ZMiTqcAfwpKJAjM2LCmrJO66m1S45rI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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