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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1c274141b44a901896e0fa212e5b1f73f0871c8a7939c843740d0490dd5ed78' 
  AND token = 'lNM5LUaoy3PWrSHN193KUUP45slTDPsIlPH9AsgahqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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