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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dabe5eace5e6685c9ab5e84a82f02ea3dda386eeecb219e49c940c4687c7d402' 
  AND token = 'YEDDa9/3FHkfKfp61RB72J0/lPRFL1Bq0FkxwY4T9W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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