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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '724aa4b4392bfe80340a56dc9bbc7cf409a27b5a2dab6c64a451ed0a779133c4' 
  AND token = 'EwcnEmlG8FMMBp0PogkLqQ59f4FcHRHSyFgadgmHNQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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