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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'edcd8ff77899558b51ca8d6abb87821b839f9a3dbb7dee11dd95cbcba9fb9ca7' 
  AND token = 'kqvUp98yBc2gH6zLDicVsO78wFGCxH6yJr024CCKPTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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