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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6c718863459164981e09ed41c55075408ee404a772ee78d53a05f4434b2f22b' 
  AND token = 'CSk9s/bRrbuXr7ARroGMbfey6gdSjao5kT7bFT28Tt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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