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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5259c7490e8b596ecfbe0f5524c79ded9639eb4ff47e5a0fdd430f3afc03a732' 
  AND token = 'eUgs4vLiWNdn7S6tUmNZFmqWDDN8HMG6+5n69rOfhz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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