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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '970b4cdc4fa932a5915ae09a70239811db29144fddfa75247e7fd799fa191bef' 
  AND token = 'JC4LyJaDe7y1aS30lPj/+TQZNvdgWU+MkqStyUYigMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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