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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9f7d2342ab34f8aadde8e73e83dc6e67fc7875f89f767e0cc0a1e18c7b1b12a' 
  AND token = 'mmNdL3AELPzndBy6A67Y4zfGSsJq4Y8y6fVNkVKo0Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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