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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0eac0c5384e4c70254d85a830dce9b501dcb1acd4574ba77be1c92c60286cc77' 
  AND token = 'lThHwTeVZgtpFKP2FU3MfeWndwVz5o1lIt4KMkaQfqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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