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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87133064e5a8cc520f5294637fc0709bbd871d407a2e2ae55ab1b8b76105394f' 
  AND token = 'OXr1Q2F3MmaAoCTpunSjamy5nMB6d0uj0nGU54VCxec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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