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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fee3ca9a0385252a0934eab263f449841b23f491b6015f05632ef4152c0a6f49' 
  AND token = 'fC5X0Q3wzEeOsJWOJYz/m9XHTl6i0VVS0DMZ9mFBidQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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