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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abb07ffb6bdf27c6edcb80f951ff7583891cf88f2564c5f940d6ac3e6d5cf44a' 
  AND token = 'VtopfUjh7CM9Vkmzn/zd3kHs7IeKWdfKJxC6aUTPtus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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