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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0fa1e39f9b5ef84987e1610eaa84382b57c2f246c9d3a1c56f6e5a858cc4d6b6' 
  AND token = 'kskMYqPU4LS6WteTpE1dEUr4Z1cSyMwOeboyUEqP0a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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