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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6797158739d9c5a6a5864adea2df3a059d71e0ff143526e5d211ac480435e3e0' 
  AND token = 'RBtmBrNhnBwZEAiRpSruWTB6Uvor8YgyJoaZl9v4XRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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