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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b170b1aa76204abe44b675bf512f3c0f74e359647698d1f1b292d3aa2ce6d5e5' 
  AND token = '8vDWlf54E1sM6nRavl/fAr2Y5XgSzRJB/AhUX17fIiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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